We want to make several standalone transmitters which transmit OFDM
signals synchronized with 1pps signal and external 10MHz closk using
USRP2.
We want to implement the transmitters using FPGA, while daughter board
parameters and interpolation rate are fixed.
We will transmit frames which
Hi, all,
Can anyone tell me which function in Python could I use to generate a
fixed length of 0s and 1s? I know in matlab we could just use
randsrc(x, y, 0:1), while I've no idea how to implement it in Python.
Thanks for ur help!
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yufeng wang wrote:
Can anyone tell me which function in Python could I use to generate a
fixed length of 0s and 1s? I know in matlab we could just use
randsrc(x, y, 0:1), while I've no idea how to implement it in Python.
Thanks for ur help!
Look at the linear shift feedback register
Hi Gnuradio People, :-)
I tried to get the UDP sink and UDP source to work.
But it didn't work as it should. The FFT Plots only
shows a white screen. The CPU of my Work PC is under
100% and my Server PC too. Should this be a Problem of
threads ?
I have a network traffic between the connected
Hi All again, :-)
i tried to change the Y/Div value with a slider, but this
do not work.
So how can i change the Variables of the FFT-Plot Sink
during execution?
Is there a possibility to change the x/Div ?
Regards Markus
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Do you have any hints for me?
Unless I am misunderstanding your diagram, I think you need something
to slow down rate of the cosine source ([COS SOURCE]--/\--[UDP
Sink 1]). If you connect it to a non-rate limited sink it will just
pump out samples as fast as it can, hence your 100% CPU
http://www.vtnews.vt.edu/story.php?relyear=2009itemno=83
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Robert McGwier wrote:
http://www.vtnews.vt.edu/story.php?relyear=2009itemno=83
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Way to go, Tom.
--
Marcus Leech
Principal
Frank Brickle wrote:
On Thu, Feb 12, 2009 at 7:59 PM, Marcus D. Leech mle...@ripnet.com
mailto:mle...@ripnet.com wrote:
I'm looking into this for a friend who wants to use his USRP2 for EME.
I'll see if I can do something JT65-like (or exactly that!)
in Gnu Radio.
You
yufeng wang wrote am 2009-02-13 14:34:
Hi, all,
Can anyone tell me which function in Python could I use to generate a
fixed length of 0s and 1s? I know in matlab we could just use
randsrc(x, y, 0:1), while I've no idea how to implement it in Python.
Thanks for ur help!
If you want to have
The y per div is controlled by the dB/div radio buttons to the right of
the fft plot.
For the X axis, the max and min are set by the sample rate, and the
number of tick marks are set by x_divs... the x_per_div setting is
derived from this.
See
Hello, all!
Our team is trying to find out the relationship between PER and Received Signal
Strength as well as the relationship between Distance and Received Signal
Strength under DBPSK modulation scheme using two USRP borads. Our test was set
up in a near free space environment, but the
On Fri, Feb 13, 2009 at 10:28 AM, Marcus D. Leech mle...@ripnet.com wrote:
So, just feed the audio as if it's a baseband signal right into the
USRP? Or do I need to put it through an SSB modulator
first?
You'll want to modulate it. WSJT gives real output. Of course modulating
here means
Ok - so I have packets coming in from both USRP2's now, getting dumped
to their separate files.
My app prints out the timestamp of each frame that gets sent to the
copy handler: if my 1PPS source is working properly, should the
timestamps coming out of the two USRP2's be identical?
Another
Couldn't you just tell the USRP's to start at a specific time to get
them to start in sync? Rather than in real-time telling them to start
immediately and having that lag.
Tim
---
Timothy R. Newman, Ph.D.
Wireless @ Virginia Tech
447 Durham Hall
Newman, Timothy wrote:
Couldn't you just tell the USRP's to start at a specific time to get
them to start in sync? Rather than in real-time telling them to start
immediately and having that lag.
Yes, you need to use the receive at functionality. The call to
receive on the host side takes
Doug,
Working only on my single channel setup, what appears to happen is that there
is the time stamp for the first sample in the frame. The frame alignment seems
to remain a function of when the device was turned on.
Now if sync_every_pps worked with the 31 December 2008 firmware. I think I
Suprin, Charles E. wrote:
Doug,
Working only on my single channel setup, what appears to happen is
that there is the time stamp for the first sample in the frame. The
frame alignment seems to remain a function of when the device was
turned on.
NO. Frame alignment is under explicit control
Matt,
I had not seen your other post before I responded to the first one.
How do you do a receive at? Looking at
usrp2/host/apps/include/usrp2/usrp2.h, the only function I see is
start_rx_streaming which does not have a timestamp in it.
As for the sync_every_pps, if one is running two
Suprin, Charles E. wrote:
Matt,
I had not seen your other post before I responded to the first one.
How do you do a receive at? Looking at
usrp2/host/apps/include/usrp2/usrp2.h, the only function I see is
start_rx_streaming which does not have a timestamp in it.
As for the
Hello Swapna,
The SNR in wireless channel cannot be measured but it can be estimated. One
way to do that for constant envelope modulation such as PSK is by measuring the
variance in the received signal envelope. Ideally you should receive a constant
stable envelope of your signal. However, due
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